📝 update JSDoc

Issue: CLDSRV-823

Author: DarkIsDude

lib/api/bucketGet.js

@@ -259,7 +259,9 @@ function handleResult(listParams, requestMaxKeys, encoding, authInfo, bucketName
  *                               requester's info
  * @param  {object} request - http request object
  * @param  {function} log - Werelogs request logger
+ * @param  {function} callback - callback optional to keep backward compatibility
  * @return {Promise<object>} - object containing xml and additionalResHeaders
+ * @throws {Error}
  */
 async function bucketGet(authInfo, request, log, callback) {
     if (callback) {